It means professional players who play ultra-short-term games, sum up their experience, and stick to trading with 1 minute ultra-short line as the K line. Finally, under normal circumstances, the prices they get are not very ideal, and those who play ultra-short-term generally pursue stability and progress. Under normal circumstances, I won't hold positions overnight. Personally, I feel a little one-sided. My personal operation is mainly Japanese K, and I almost close my position when I make money. If you lose money, you will stay overnight, because the night market is only two hours, and the white market is the real market.